docs: def getBasePrice(self,**kwargs):
          '''
          This method overrides the method of the base Event class by
          checking the pricingTier associated with this PrivateLessonEvent and getting
          the appropriate price for it.
          '''
          if not self.pricingTier:
              return None
          return self.pricingTier.getBasePrice(**kwargs) * max(self.numSlots,1)